CN109756140A - A kind of Y source inventer with raising step-up ratio - Google Patents
A kind of Y source inventer with raising step-up ratio Download PDFInfo
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- CN109756140A CN109756140A CN201910046582.XA CN201910046582A CN109756140A CN 109756140 A CN109756140 A CN 109756140A CN 201910046582 A CN201910046582 A CN 201910046582A CN 109756140 A CN109756140 A CN 109756140A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
A kind of Y source inventer with raising step-up ratio, is related to inverter technology field.Solving existing Y source inventer, there are leakage inductances, the problem of causing Y source inventer output voltage limited, influence the efficiency of inverter.The present invention includes the source Y coupling circuit, inversion bridge circuit and clamp circuit；Clamp circuit includes capacitor C2, capacitor C3With diode D2；Capacitor C3Anode and diode D2Cathode connect the signal input parts of the source Y coupling circuit simultaneously；Diode D2Anode connection capacitor C2Cathode and power supply VinAnode, capacitor C3Cathode connect power supply V simultaneouslyinCathode and inversion bridge circuit negative input；Capacitor C2Anode connection the source Y coupling circuit signal output end；The signal output end of the electrode input end connection source the Y coupling circuit of inversion bridge circuit；The ac output end of the inversion bridge circuit is used to be power grid or load supplying.The present invention is suitable as inverter use.
Description
Technical field
The present invention relates to inverter technology fields.
Background technique
Solar photovoltaic generation system is mainly made of battery group, battery control group and photovoltaic DC-to-AC converter, and inverter is
The key equipment of photovoltaic generating system, the direct current for the larger fluctuation that photovoltaic exports is converted to the friendship of amplitude and frequency stabilization by it
Galvanic electricity is supplied to power grid, therefore it is required that its reliability and transfer efficiency [5] with higher.Traditional inverter has the following
Defect, by taking voltage source inverter as an example, the amplitude of the output AC voltage of voltage source inverter can only be lower than DC bus-bar voltage,
So higher DC input voitage is needed, this Boost boosting inverter electricity that just needs to connect between inverter and power supply
Road, but additional Boost circuit increases the cost and volume of system again, two-stage type circuit form also increases inversion
The control complexity of system.
If two switches simultaneously turn on the same bridge arm of synchronization up and down, huge through current damage derailing switch can be generated
There is straight-through phenomenon to prevent inverter, it is necessary to inject the dead zone period, this will lead to the generation of inverter output voltage waveform in part
Distortion.
A series of impedance source converter (Coupled-Inductor with coupling inductance proposed in recent years
Impedance-Source Inverter, CI-ISI) promotion have a meeting, an audience, etc. well under one's control composition and division in a proportion relatively be applicable in.It is compared with other impedance source converters,
CI-ISI can obtain higher step-up ratio in the case where small straight-through duty ratio.Further, since the step-up ratio of CI-ISI can
To change by adjusting turn ratio, so theoretically step-up ratio is not restricted.Y source inventer is as a kind of emerging CI-
ISI, superior performance, using coupling inductance and capacitor, straight-through using control inverter bridge leg promotes DC bus-bar voltage.
Although the introducing of coupling inductance improves the boost performance of Z-source inverter, the leakage inductance in coupling inductance is but
Very big problem can be brought to circuit.Z-source inverter is by switching straight-through (Shoot-Through, ST) state and non-straight
Logical (Non-Shoot-Through, NST) state works, in the handoff procedure of state, due to the electricity in coupling inductance
Stream is instantaneously changing, and generates so having very big due to voltage spikes at leakage inductance both ends.Currently, all CI-ISI can be by this
A due to voltage spikes is coupled on DC-link voltage, and due to voltage spikes is that inverter switching device pipe brings very big voltage stress.Therefore
In the case where the cost of inverter switching device pipe and characteristic are controlled, the output voltage of CI-ISI often can not be made too
Otherwise height will lead to the damage of switching tube.This characteristic limits the practical application of CI-ISI.
Summary of the invention
The purpose of the present invention is to solve existing Y source inventers there are leakage inductance, cause Y source inventer output voltage by
The problem of limiting, influencing the efficiency of inverter proposes a kind of with the Y source inventer for improving step-up ratio.
It is of the present invention a kind of with the Y source inventer for improving step-up ratio, including the source Y coupling circuit and inverter bridge electricity
Road, which is characterized in that further include clamp circuit；Clamp circuit includes capacitor C2, capacitor C3With diode D2；
Capacitor C3Anode and diode D2Cathode connect the signal input parts of the source Y coupling circuit simultaneously；Diode D2's
Anode connects capacitor C simultaneously2Cathode and power supply VinAnode, capacitor C3Cathode connect power supply V simultaneouslyinCathode and inverter bridge
The negative input of circuit；
Capacitor C2Anode connection the source Y coupling circuit signal output end；The electrode input end of inversion bridge circuit connects the source Y
The signal output end of coupling circuit；The ac output end of the inversion bridge circuit is used to be power grid or load supplying.
Y source inventer of the present invention has the DC bus-bar voltage spike of very little, and can recycle consumption and open
The energy on pipe is closed, the efficiency of inverter is improved in high-power situation.Y source inventer of the present invention has continuous
Input current is suitable for photovoltaic, the application fields such as battery.Big current harmonics will not be introduced to input side, be effectively ensured
The service life of power supply.
Detailed description of the invention
Fig. 1 is the circuit diagram of the Y source inventer of the present invention for having and improving step-up ratio；
Fig. 2 is the equivalent circuit diagram of Y source inventer circuit under pass-through state；
Fig. 3 is the equivalent circuit diagram of Y source inventer circuit under non-pass-through state；
Fig. 4 is the waveform diagram of input voltage and input current and output voltage electric current；
Fig. 5 is the diode current voltage of Y source inventer and the waveform diagram of busbar voltage；
Fig. 6 is the diode current voltage of Y source inventer and the waveform diagram of busbar voltage；
Fig. 7 is efficiency comparative's figure of existing Y source inventer and Y source inventer of the invention.
Specific embodiment
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, how to apply to the present invention whereby
Technological means solves technical problem, and the realization process for reaching relevant art effect can fully understand and implement.This Shen
Please each feature in embodiment and embodiment, can be combined with each other under the premise of not colliding, be formed by technical solution
It is within the scope of the present invention.
Specific embodiment 1: illustrating present embodiment below with reference to Fig. 1, one kind described in present embodiment, which has to improve, to be risen
The Y source inventer of pressure ratio, including the source Y coupling circuit and inversion bridge circuit, further include clamp circuit；Clamp circuit includes capacitor
C2, capacitor C3With diode D2；
Capacitor C3Anode and diode D2Cathode connect the signal input parts of the source Y coupling circuit simultaneously；Diode D2's
Anode connects capacitor C simultaneously2Cathode and power supply VinAnode, capacitor C3Cathode connect power supply V simultaneouslyinCathode and inverter bridge
The negative input of circuit；
Capacitor C2Anode connection the source Y coupling circuit signal output end；The electrode input end of inversion bridge circuit connects the source Y
The signal output end of coupling circuit；The ac output end of the inversion bridge circuit is used to be power grid or load supplying.
Y source inventer of the present invention has good boost capability, can realize in the case where single-stage higher
Step-up ratio realizes high power density so that the volume of inverter entirety is not too large.Y source inventer of the present invention by
It in reducing the switching loss as caused by DC bus-bar voltage spike, therefore can work under the conditions of high switching frequency, realize
The high frequency of inverter has good dynamic property.
Specific embodiment 2: illustrating present embodiment below with reference to Fig. 1, present embodiment is to described in embodiment one
It is a kind of to be described further with the Y source inventer for improving step-up ratio,
The source Y coupling circuit include coupling inductance N1, coupling inductance N2, coupling inductance N3, capacitor C1With diode D1；
Coupling inductance N1Different name end, coupling inductance N2Same Name of Ends and coupling inductance N3Same Name of Ends be coupled；Coupling electricity
Feel N3Different name end be the source Y coupling circuit signal input part, coupling inductance N1Same Name of Ends connect diode D1Anode；
Coupling inductance N2Different name end connect capacitor C1Cathode, capacitor C1Cathode connecting diode D1Cathode as Y
The signal output end of source coupling circuit.
Specific embodiment 3: illustrating present embodiment below with reference to Fig. 1, present embodiment is to described in embodiment one
It is a kind of to be described further with the Y source inventer for improving step-up ratio, it further include input inductance Lin, input inductance LinOne end
For connecting power supply VinAnode, input inductance LinThe other end connect diode D simultaneously2Anode and capacitor C2Cathode.
Specific embodiment 4: illustrating present embodiment below with reference to Fig. 2 and Fig. 3, present embodiment is to embodiment one
A kind of Y source inventer with raising step-up ratio is described further, and inverter bridge circuit equivalent is switch SW, when straight-through
When mode, equivalent switch SW closure, when non-direct mode operation, equivalent switch SW is disconnected.
Specific embodiment 5: present embodiment is to a kind of inverse with the source Y for improving step-up ratio described in embodiment one
Become device to be described further,
The step-up formula of Y source inventer:
Wherein, VdcFor the DC bus-bar voltage of Y source inventer, K is the turn ratio of coupling inductance,VinFor
Input supply voltage, VoFor the output voltage of Y source inventer, M is modulation ratio, and duty ratio when d is pass-through state, B is boosting
Coefficient.
Circuit of the present invention includes power supply Vin, input inductance Lin, coupling inductance N1, N2, N3, three capacitor C1, C1, C2, two
Diode D1, D2With inverter leg switching tube S1, S2, S3, S4.It can capacitor C2, C3With diode D2Clamp circuit is constituted, is made
Due to voltage spikes will not be generated on DC bus by obtaining.
Specific embodiment 6: present embodiment is to a kind of inverse with the source Y for improving step-up ratio described in embodiment one
Become device to be described further, capacitor C1, capacitor C2With capacitor C3It is electrolytic capacitor.
Y source inventer operating mode of the present invention is identical with tradition Y source inventer, is divided into direct mode operation and non-straight-through
Mode.The equivalent circuit of both of which is as shown in Figures 2 and 3.In order to facilitate analysis, load is equivalent to a current source, inversion
The direct mode operation of bridge bridge arm and non-direct mode operation can be equivalent to the open and close of switch SW.If Fig. 2 is under direct mode operation, etc.
Imitate switch SW closure.As shown in Figure 3 under non-pass-through state, equivalent switch is disconnected.
The clamp circuit of Y source inventer of the present invention includes capacitor C2, C3With diode D2See in Fig. 1 and works as circuit
When becoming non-direct mode operation from direct mode operation, diode D2It can be connected, so that the voltage on bus is no more than VC2+VC3.Cause
This bus spike can be eliminated.
In order to verify the practicability of Y source inventer of the present invention, devise based on DSP TMS320F28335's
200W experiment porch.Coupling inductance COEFFICIENT K=3 (N1:N2:N3=40:40:80), coefficient B=2.5 of boosting, modulation ratio M=0.8.
Input voltage is 80V, and inverter DC bus-bar voltage 200V, output rated voltage is 110V AC, 50Hz, loads R=60 Ω,
Switching frequency is 40kHz.
Fig. 4 is novel Y source inventer input current voltage, exports Current Voltage experimental waveform.Straight-through duty ratio is 0.13,
Output voltage is 155V (theoretical value 160V), and in figure, t is the time, and 10ms/div indicates the every lattice of 10ms；Similarly, Fig. 5 and Fig. 6
In div also represent each lattice in figure.
Fig. 5 is diode voltage current waveform and busbar voltage waveform.In novel Y source inventer, busbar voltage is
200V, and due to voltage spikes is only 30V, effectively eliminates the due to voltage spikes on bus.As a comparison, Fig. 6 illustrates the source script Y
The diode voltage current waveform and busbar voltage waveform of inverter.In Y source inventer, busbar voltage 200V, and it is electric
Pointing peak has reached 330V.
Fig. 7 is efficiency comparative's figure of existing Y source inventer and Y source inventer of the invention, it can be seen that Y of the invention
The more existing Y source inventer of source inventer efficiency in low-power is high-efficient, this is because increased device exacerbates in circuit
Power loss.And in high-power situation, it is lost since clamp circuit has recycled the partial switch as caused by due to voltage spikes, because
And it has higher efficiency.
Although disclosed herein embodiment it is as above, the content is only to facilitate understanding the present invention and adopting
Embodiment is not intended to limit the invention.Any those skilled in the art to which this invention pertains are not departing from this
Under the premise of the disclosed spirit and scope of invention, any modification and change can be made in the implementing form and in details,
But scope of patent protection of the invention, still should be subject to the scope of the claims as defined in the appended claims.
Claims (6)
1. a kind of with the Y source inventer for improving step-up ratio, including the source Y coupling circuit and inversion bridge circuit, which is characterized in that also
Including clamp circuit；Clamp circuit includes capacitor C2, capacitor C3With diode D2；
Capacitor C3Anode and diode D2Cathode connect the signal input parts of the source Y coupling circuit simultaneously；Diode D2Anode
Capacitor C is connected simultaneously2Cathode and power supply VinAnode, capacitor C3Cathode connect power supply V simultaneouslyinCathode and inversion bridge circuit
Negative input；
Capacitor C2Anode connection the source Y coupling circuit signal output end；The electrode input end connection source the Y coupling of inversion bridge circuit
The signal output end of circuit；The ac output end of the inversion bridge circuit is used to be power grid or load supplying.
2. a kind of with the Y source inventer for improving step-up ratio according to claim 1, which is characterized in that the source Y coupling circuit packet
Include coupling inductance N1, coupling inductance N2, coupling inductance N3, capacitor C1With diode D1；
Coupling inductance N1Different name end, coupling inductance N2Same Name of Ends and coupling inductance N3Same Name of Ends be coupled；Coupling inductance N3
Different name end be the source Y coupling circuit signal input part, coupling inductance N1Same Name of Ends connect diode D1Anode；
Coupling inductance N2Different name end connect capacitor C1Cathode, capacitor C1Cathode connecting diode D1Cathode as the source Y coupling
Close the signal output end of circuit.
3. a kind of with the Y source inventer for improving step-up ratio according to claim 1, which is characterized in that further include input electricity
Feel Lin, input inductance LinOne end for connecting power supply VinAnode, input inductance LinThe other end connect diode D simultaneously2
Anode and capacitor C2Cathode.
4. a kind of with the Y source inventer for improving step-up ratio according to claim 1, which is characterized in that inversion bridge circuit etc.
Effect is switch SW, and when direct mode operation, equivalent switch SW closure, when non-direct mode operation, equivalent switch SW is disconnected.
5. a kind of with the Y source inventer for improving step-up ratio according to claim 1, which is characterized in that the liter of Y source inventer
Press formula:
Wherein, VdcFor the DC bus-bar voltage of Y source inventer, K is the turn ratio of coupling inductance,VinFor input electricity
Source voltage, VoFor the output voltage of Y source inventer, M is modulation ratio, duty ratio when d is pass-through state, and B is boosting coefficient.
6. a kind of with the Y source inventer for improving step-up ratio according to claim 1, which is characterized in that capacitor C1, capacitor C2
With capacitor C3It is electrolytic capacitor.
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| CN201910046582.XA CN109756140A (en) | 2019-01-17 | 2019-01-17 | A kind of Y source inventer with raising step-up ratio |
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| CN201910046582.XA CN109756140A (en) | 2019-01-17 | 2019-01-17 | A kind of Y source inventer with raising step-up ratio |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110768552A (en) * | 2019-11-08 | 2020-02-07 | 东北电力大学 | Double-coil coupling inductance type impedance source inverter for inhibiting DC link voltage peak |
| CN112054672A (en) * | 2020-09-02 | 2020-12-08 | 青岛理工大学 | DC-DC high-voltage gain converter integrating switched capacitor and Y-source network |
| CN113422394A (en) * | 2021-04-20 | 2021-09-21 | 东北大学 | Power coordination control system and method based on double-Y-source five-level inverter |
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2019
- 2019-01-17 CN CN201910046582.XA patent/CN109756140A/en active Pending
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110768552A (en) * | 2019-11-08 | 2020-02-07 | 东北电力大学 | Double-coil coupling inductance type impedance source inverter for inhibiting DC link voltage peak |
| CN112054672A (en) * | 2020-09-02 | 2020-12-08 | 青岛理工大学 | DC-DC high-voltage gain converter integrating switched capacitor and Y-source network |
| CN113422394A (en) * | 2021-04-20 | 2021-09-21 | 东北大学 | Power coordination control system and method based on double-Y-source five-level inverter |
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